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Short-term toxicity to aquatic invertebrates

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Description of key information

No effects up to the limit of water solubility (OECD 203).

Key value for chemical safety assessment

Additional information

One study investigating the short-term toxicity of Fatty acids, C18 unsaturated, trimers, 2-ethylhexyl esters (CAS No. 173832-46-7) to aquatic invertebrates is available. The GLP study was performed under static conditions according to OECD guideline 202 using Daphnia magna as test organism (Harding, 1997). The substance was tested in concentrations of 1, 10 and 100 mg/L (nominal). After 48 hours, 35% immobilization was reported at concentrations of 10 and 100 mg/L, whereas 10% immobilization was observed at the lowest concentration of 1 mg/L. The observed effects occurred above the water solubility of the substance and therefore, they are expected to be physical (caused by direct interference with undissolved test substance) rather than due to intrinsic toxicity. Indeed, high turbidity of test medium was observed at the highest concentration of 100 mg/L, indicating the possibility of physical effects. The EC50 (48 h) was determined to be > 100 mg/L on the basis of the nominal concentration.